RT Article T1 Kelsen and Aquinas: A Conflict Over the Nature of Law and Legal Obligation JF The jurist VO 34 SP 94 OP 106 A1 Underwood Lewis, John LA English PB School of Canon Law, The Catholic University of America YR 1974 UL https://www.ixtheo.de/Record/1650235917 K1 Kelsen, Hans : 1881-1973 K1 Thomas : von Aquin, Heiliger : 1225-1274 K1 Rechtsbegriff